Borisov Sergey M, Pommer Reinhold, Svec Jan, Peters Sven, Novakova Veronika, Klimant Ingo
Institute of Analytical Chemistry and Food Chemistry , Graz University of Technology , Stremayrgasse 9 , 8010 , Graz , Austria . Email:
Department of Pharmaceutical Chemistry and Pharmaceutical Analysis , Faculty of Pharmacy in Hradec Kralove , Charles University , Akademika Heyrovskeho 1203 , Hradec Kralove , Czech Republic.
J Mater Chem C Mater. 2018 Sep 7;6(33):8999-9009. doi: 10.1039/c8tc02726a. Epub 2018 Aug 2.
New complexes of Zn(ii), Pd(ii) and Pt(ii) with Schiff bases are prepared in a one-step condensation of 4-(dibutylamino)-2-hydroxybenzaldehyde and 4,5-diaminophthalonitrile in the presence of a metal salt. The complexes possess efficient absorption in the blue-green part of the spectrum with molar absorption coefficients up to 98 000 M cm. The Pt(ii) complex shows very strong red phosphorescence in anoxic solutions at room temperature with a quantum yield of 65% in toluene which places it among the brightest emitters available for this spectral range. The phosphorescence of the Pd(ii) complex under the same conditions is very weak ( < 1%) but is enhanced to > 10% upon immobilization into polymers. Optical thermometers based on self-referenced lifetime read-out are prepared upon immobilization of the dyes into gas-blocking poly(vinylidene chloride--acrylonitrile). At 25 °C, the materials based on Pd(ii) and Pt(ii) complexes show sensitivities of -2.1 and -0.52%/K, respectively. Application of the sensors for imaging of temperature on surfaces (planar optode) and for monitoring of fast temperature fluctuations (fiber-optic microsensor) is demonstrated. Immobilized into a gas-permeable matrix, the Pt(ii) complex also performs as a promising oxygen-sensing material. The new systems are also attractive for imaging of oxygen or temperature with the help of multi-photon microscopy, due to a good match with the biological optical window and much better brightness under two photon excitation compared to that of the conventional Pt(ii) -tetra-(pentafluorophenyl)porphyrin.
在金属盐存在下，通过4-(二丁基氨基)-2-羟基苯甲醛与4,5-二氨基邻苯二甲腈一步缩合制备了锌（II）、钯（II）和铂（II）与席夫碱的新型配合物。这些配合物在光谱的蓝绿色部分具有高效吸收，摩尔吸收系数高达98000 M cm。铂（II）配合物在室温下的无氧溶液中表现出非常强的红色磷光，在甲苯中的量子产率为65%，使其成为该光谱范围内最亮的发光体之一。钯（II）配合物在相同条件下的磷光非常弱（<1%），但固定在聚合物中后可增强至>10%。将染料固定在阻气性聚（偏二氯乙烯-丙烯腈）中，制备了基于自参考寿命读出的光学温度计。在25°C时，基于钯（II）和铂（II）配合物的材料的灵敏度分别为-2.1%/K和-0.52%/K。展示了这些传感器在表面温度成像（平面光极）和快速温度波动监测（光纤微传感器）中的应用。固定在透气基质中的铂（II）配合物也可作为一种有前景的氧传感材料。由于与生物光学窗口良好匹配，并且在双光子激发下比传统的铂（II）-四（五氟苯基）卟啉具有更好的亮度，这些新系统在借助多光子显微镜进行氧或温度成像方面也具有吸引力。
